Portion of a mold insert for forming concrete blocks



FIG. 1 is a perspective view of a portion of a mold insert for forming concrete blocks.

FIG. 2 is a reduced rear elevational view of FIG. 1.

FIG. 3 is a front elevational view of FIG. 1.

FIG. 4 is a top plan view of FIG. 1.

FIG. 5 is a right side elevational view of FIG. 1.

FIG. 6 is a left side elevational view of FIG. 1; and,

FIG. 7 is a bottom plan view of FIG. 1.

The broken lines in the drawings are included for the purpose of illustrating portions of the mold insert that form no part of the claimed design. 

The ornamental design for a portion of a mold insert for forming concrete blocks, as shown and described. 